Abstract
The objective of the present study was to analyze the electromyographic activity (EMG) of long head Bíceps Femoris (BF) and Semitendinosus (ST) muscles during knee flexion movements in two different machines: Prone leg curl (decubitus ventral position) and Seated leg curl (sitting position). Nine bodybuilders aged 20 to 40 years old participated in this study. They followed a protocol specifying 5 repetitions of flexion of the knee in each machines. EMG activity was recorded using surface electrodes and data were expressed in terms of root mean squares (RMS). Statistical analysis employed T Test (data paired). There was greater EMG amplitude of BF and ST in decubitus ventral position with a statistically significant difference for the BF muscle. There is greater muscle activation of the hamstrings during flexion exercises performed on the prone leg curl suggesting that this equipment is more efficient than the chair for training with the aim of improving the capacity of muscle activation.
Highlights
FLANAGAN, S. et al Squatting exercises in older adults: kinematic and kinetic comparisons
electromyographic activity (EMG) activity was recorded using surface electrodes and data were expressed in terms of root mean squares (RMS)
There is greater muscle activation of the hamstrings during flexion exercises performed on the prone leg curl suggesting that this equipment is more efficient than the chair for training with the aim of improving the capacity of muscle activation
Summary
Foram avaliados nove praticantes de musculação, com idades entre 20 e 40 anos (massa corporal 75,4 ± 10,56 Kg; estatura 177,55 ± 5,47 cm) e tempo de prática de 2 a 8 anos. Pelo critério para participar da pesquisa, os voluntários não poderiam apresentar antecedentes de lesões musculoesqueléticas, dor, trauma e/ou cirurgia nos membros inferiores anteriores a seis meses e deveriam ter pelo menos um ano de prática de musculação. As coletas de todos os dados apresentados neste estudo foram realizadas na Academia Racer, em Florianópolis, Santa Catarina. Este estudo foi aprovado pelo Comitê de Ética em Pesquisa da Universidade do Estado de Santa Catarina – UDESC (protocolo n.o 136/2007), para atender à Resolução N.o 196/96 do Conselho Nacional de Saúde. Análise eletromiográfica dos músculos posteriores da coxa na cadeira e mesa flexora
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